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While no specific reason has been given as to what spurred him to shoot dead 12 victims at Washington’s Navy Yard, the shooter’s overall mindset came into sharper focus Tuesday — including a history of psychological issues.

The FBI released this image of Navy Yard gunman Aaron Alexis.

That past includes a Newport, Rhode Island, incident on August 7, more than five weeks before Aaron Alexis was gunned down after single-handedly pulling off America’s latest mass shooting.

Describing himself as a Navy contractor, Alexis told police he believed an individual he’d gotten into a verbal spat with had sent three “people to follow him and keep him awake by talking to him and sending vibrations into his body,” according to a police report. Alexis said he hadn’t seen any of these people, but insisted they’d followed him between three hotels in the area — the last being a Marriott, where police investigating a harassment complaint encountered him.

There, Alexis told authorities that the unseen individuals continued speaking to him through walls and floor, as well as used “some sort of microwave machine” to send vibrations into his body.